SINOx^® is Johnson Matthey’s SCR catalyst product. The SINOx^® System is based on SCR (Selective Catalytic Reduction), the most effective and proven process for nitrogen oxide reduction. Using the process, nitrogen oxides are transformed into harmless nitrogen and water by reaction with a reducing agent such as ammonia (NH₃) or urea (CO(NH₂)₂) in the presence of a suitable catalyst. In the system, the exhaust gas flow through the SINOx^® catalyst, which is integrated into the exhaust-gas line, with a precisely dosed injection of the reducing agent. The chemical reactions proceed rapidly and selectively, i.e. without undesired side reactions, as described by the following equations:

4 NO + 4 NH₃ + O₂ → 4 N₂ + 6 H₂O
6 NO₂ + 8 NH₃ → 7 N₂ + 12 H₂O

Or: NO_x + Reducing agent → Nitrogen and water

The reducing agent consists of aqueous solutions of ammonia or urea. Both have proven their suitability for the catalytic reduction of nitrogen oxides in many applications.

The advantage of the SCR-process is the achievement of high NOx reduction rate and low ammonia slip.  

The SCR-process is “state of the art” technology for power plants and other industrial applications because of its high efficiency.